The Castle of Robert Le Diable is one of the highlights in the Seine valley. It is the fourth ruin we visited after the two Abbeys of Jumièges and Mortemer and the ruins of Chateau Gaillard (the castle of Richard Lionheart).
There is only little known about Robert Le Diable (he is said to be Robert the Magnificent, father of William the Conqueror), so that you will hear many legends about him. According to them, he built this castle. It was destroyed in 1204 by Jean Sans-Terre and reconstructed later by the French King Philipp II. In the 15th century, it was destroyed by the people of Rouen.
In the ruins, you will find also a viking museum with the story about the Normans, especially William the Conqueror and his father. The information is not bad and there was an impressive viking ship. Anyway, one of the first things coming into my mind are the not so beautiful wax figures of Robert and family. Somehow, I expected more - but the ruins will compensate the visit :)